Hi to you all.I am a 47 year old man who due to an accident am disabled and bought myself an Arduino to keep myself busy. I am new to arduino and have written some basic sketches. and have made some nice projects. I have an UNO R3 board and I have made an analog keypad using 12 tactile buttons and 7 resistors with a 1nf capacitor to help with bouncing. i did this so that all my digital pins are free to use. My idea is to make an alarm system using 2 PIR sensors, 4 LED's, a buzzer and a sir ...